<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>分类参数</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" show-icon :closable="false"></el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <el-cascader
            v-model="selectedCateKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tabs 页签 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <el-tab-pane label="动态参数" name="many">
          <el-button
            type="primary"
            size="mini"
            :disabled="inBtnDisabled"
            @click="addDialogVisible = true"
          >添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" style="width: 100%;" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                >{{item}}</el-tag>
                <!-- 输入框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <!-- 参数名 -->
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <!-- 操作 -->
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="delParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性" name="only">
          <el-button
            type="primary"
            size="mini"
            :disabled="inBtnDisabled"
            @click="addDialogVisible = true"
          >添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" style="width: 100%;" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                >{{item}}</el-tag>
                <!-- 输入框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                ></el-input>
                <!-- 添加 tag 按钮 -->
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                >+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <!-- 属性名 -->
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <!-- 操作 -->
            <el-table-column label="操作">
              <template v-slot="scope">
                <el-button
                  type="primary"
                  size="mini"
                  icon="el-icon-edit"
                  @click="showEditDialog(scope.row.attr_id)"
                >编辑</el-button>
                <el-button
                  size="mini"
                  type="danger"
                  icon="el-icon-delete"
                  @click="delParams(scope.row.attr_id)"
                >删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--  添加参数对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!--  修改参数对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="eidtDialogClosed"
    >
      <el-form :model="editForm" :rules="addFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      queryInfo: {
        type: 2,
        pagenum: 0,
        pagesize: 0
      },
      selectedCateKeys: [],
      cateList: [],
      // 控制添加参数对话框的显示或隐藏
      addDialogVisible: false,
      // 控制编辑参数对话框的显示或隐藏
      editDialogVisible: false,
      addForm: {
        attr_name: ''
      },
      editForm: {},
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // tabs 被激活页签的名称
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态属性数据
      onlyTableData: []
    }
  },
  created() {
    this.getCateList()
  },
  computed: {
    // 通过 selectedCateKeys 的长度值来返回郑家值
    inBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 返回当前三级分类的 id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 返回指定标题
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }

      return '静态属性'
    }
  },
  methods: {
    // 获取分类数据列表
    async getCateList() {
      const { data: res } = await this.$http.get('categories')

      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败！')
      }

      this.cateList = res.data

      this.$message.success('商品分类数据获取成功！')
    },
    // 级联菜单改变时调用
    handleChange() {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 确认选中的是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.onlyTableData = []
        this.manyTableData = []
        return
      }

      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes`,
        {
          params: {
            sel: this.activeName
          }
        }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败！')
      }
      // 修改数据
      res.data.forEach(item => {
        // 将数据中的 attr_vals 的值修改为数组的形式
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制输入框的显示或隐藏
        item.inputVisible = false
        // 输入框内容
        item.inputValue = ''
      })

      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 页签被点击时触发的事件处理函数
    handleTabClick() {
      this.getParamsData()
    },
    // 关闭添加参数对话框时执行的事件处理函数
    addDialogClosed() {
      // 重置表单
      this.$refs.addFormRef.resetFields()
    },
    // 添加参数
    addParams() {
      // 先对表单进行验证
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return

        const { data: res } = await this.$http.post(
          `categories/${this.cateId}/attributes`,
          {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          }
        )

        if (res.meta.status !== 201) {
          return this.$message.error('添加失败！')
        }

        this.$message.success('添加成功！')

        this.addDialogVisible = false

        this.getParamsData()
      })
    },
    // 显示修改参数对话框
    async showEditDialog(attr_id) {
      const { data: res } = await this.$http.get(
        `categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: {
            attr_sel: this.activeName
          }
        }
      )

      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败！')
      }

      this.editForm = res.data

      this.editDialogVisible = true
    },
    // 关闭修改参数对话框
    eidtDialogClosed() {
      // 重置表单
      this.$refs.editFormRef.resetFields()
    },
    // 编辑参数
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return

        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
          {
            attr_name: this.editForm.attr_name,
            attr_sel: this.activeName
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('参数更新失败！')
        }

        this.$message.success('参数修改成功！')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 删除参数
    async delParams(attr_id) {
      const confirm = await this.$confirm(
        '此操作将永久删除该参数, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch(err => err)

      if (confirm !== 'confirm') {
        return this.$message.info('已取消删除！')
      }

      const { data: res } = await this.$http.delete(
        `categories/${this.cateId}/attributes/${attr_id}`
      )

      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败！')
      }

      this.$message.success('删除参数成功！')
      this.getParamsData()
    },
    // 显示输入框
    showInput(row) {
      row.inputVisible = true
      // $nextTick 当页面上的元素被重新渲染后会执行回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 失去焦点或按下回车时调用
    handleInputConfirm(row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false

        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false

      // 发送请求修改参数
      this.saveAttrVals(row)
    },

    // 对 attr_vals 的操作
    async saveAttrVals(row) {
      // 发送请求修改参数
      const { data: res } = await this.$http.put(
        `categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        }
      )
      if (res.meta.status !== 200) {
        return this.$message.error('参数修改失败！')
      }
      this.$message.success('参数修改成功！')
    },
    // 删除可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
